Coil.



G. SGHRADER.

COIL.

LPPLIUATION FILED AUGA, 190s.

'Patented July 6,1909. l

.a't Ialensee, near Berlin,

. of turns of largeI cross-sectional-area,

l p'ath of the lines of force are caused bythe CARL SCHRDER, OFHALENSEE, NEAR BE RLIN, GERMANY, AsslcNoE To s'iEMENsa HALSKE, A. Cr.,OF BERLIN, GERMANY, A CORPORATION OFYGERMANY.

COIL.

No. 926,964. Specification of Application led August 4,

To all whom it may concern: V- l Be it known that I, CARL SCHRADER, asub'ect of the German Emperor, and residing l Germany, have inventedcertain new and useful Improvements in Coils, of which the following isa specification.I

The present invention relates to coils, l particularlyfor electricalpurposes, and an important object is to provide improved electricalconductors which can readily be wound into a coil having a largecross-sectional area. V

In all instances .in electromagnetic ap aratus for heavy currentsAhaving a pluraiity when it is a matter of importance to obtain as goodutilization as possible of the space which is limited to a minimumamount, as is known great difficulties are met with in constructing andarranging such windings and their ends.- This isvery noticeableparticularly when constructing electromagnetic apparatus for hi htensions, such as transformers for examp e, in which case, on account ofit being necessary to observe 'definite aths and spaces for insulation,a useless -en arge,e ment of the winding-space, which is connected withconsiderable use f material, and a positively injurious inereae inlength of the enlarged iron cores.

N ow an important object of the presentinvention is to provideconductors for making, in a more simple manner, coils having two-or mbreturns of large cross-sectional area, so that not onl are the abovementioned defects avoided,r but in addition the advantage is obtained ofbeing able to employ such coils particularly vfor closed iron cores, inwhich case the arrangement of the windings lcustomary heretofore islconnected with special technical difficulties.

In order that the invention may be clearly understood, reference will bemade to the accompanying drawing in which one en1bodi ment isrepresented by way of example, and in which:

Figure 1 is a/sectional elevation of a coil according to the present'invention, whereas Fig. 2 is a front elevation of part of a strip ofmetal prepared ready for being wound into a l comprisin Letters Patent.Patented July 6. 1909.

1908. Serial No. 446,973.

coil. Fig. 3 is a front elevation of a strip two complementary halves.dng coils of two or .more turns, according to the present inventionsuitably long strips of metal p1, p2, etc., corresponding to the numberof turns necessary in each case are employed which are provided atsuitable distances corresponding to the circumference of each turn withsuitably shaped holes I which serve for the passage 'of the inner end ofthe coil and for insu ation around the same. Such coils can beparticularly con- For ma vemently wound, since at each turn the pcr-Aforated .places of the strip of metal is simply placed over thepreviously bent, insulated, inner end, and the latter is finallymechanic ally connected with the other end of the iinished coil. Bothends are separated from one another by an insulating layer and form thelconnections of the coil. In coils 'which are made in this manner boththe' noxious .space which is produced on account of the mside orcommencing end of the coil being brought out laterally, and theenlargement of the coil or of the iron core which is to be wound whichis thereby occasioned are avoided. On account of the inner end beingpassed through the individual turns, the coil is simultaneouslyprevented from flying open. The manner in which such coil is made willbe readily understood from Figs. 1 and 2; a is the outer end ofthe stripof metal which is provided with holes Z at dcnite intervalscorresponding tothecircum- .ference of each turn. inner or commencingend b and insulated from the sides posed holes in the winding,

is passed through,

of the superand after the strip has beenv wound up the commencing end isconnected with the outer end e, a layer of insulation being placedbetween them: I v

The commencing end of the coil does' not always require to be broughtout in the center of the strip, as shown 1n Fi s. 1 and 2 of Thepreliminarily bent the accompanying drawing, ut may be passed throughthe same at optional places', for example at either edge also. Alsounder certain circumstances, for example when specially long coilsl haveto he wound, it is preferable to subdivide the strip longitudinally, forexample in suchmanner that as pim-@my of shown in Fig. 3 the stripConsists of two symmetrical hal ves L and' o. The holes l and l throughwhich the inner or commencing ends l) and li are to pass are at one edgeof each half strip.

What l olaiiu my invention and deeire to secure by Letters ljateiit is:

l. T he herein-described coil consisting o' a plurality of superposeclbroad strips oi metal corresponding in breadth to the breadth of theCoil and having` at definite intervals holes in the same correspondingto the separate turns of the oeil, through which holes the commencingend of the coil passes to the outside.

2. The herein-described coil consisting oi" a plurality of superposeclbroad strips. of metal corresponding in breadth to the breadth of thecoil and having at delinite intervals holes at one edge of the sameCorresponding to the separate turns of the coil:l through which holesthe commencing end ot the coil to the outside.

3. The herein-described coil consisting o a euperposed luoad strips ofmetal divided longitudinally into symmetrical .halves and having atilenite intervalo holes eaaoea at one edge of each half of the samecorresponding' to the separato 'turns ol" the (foil, through 'whichholes the Cmuiuoueiup; oud o l" 'the eoil passes to the outside.

The l1eieir1(lesoiil)e l coil consisting of one h ioad strip of metallcorrespoudiug iu hreadth to the lxioadth of the coil and liaviigfy atdefinito intervals moles in the same Corro- S'ponding to the separateturns of the coil, through 'Whiel'i holes the limer or commencing end ofthe coil passes to the outside.

5. The hereiwdesorilzed lu'oad stri p of metal having; a, plurality ofholes iu the same, the distauees hetweei'i oaeh two adjacent holes heingequal to the Corresponding: circumference of the individual turns of acoil Composed of said strip of" metal, substantially as described, with.reference to the drawing.

ln. testimony whereof l. have signed my name to this speeilieatifjru inthe presence of two Witnesses. l

Witnesses z i l WOLDEMAR HAUPT, HENRY HASPER.

